Pipe bowl



H. GAUVEN Nov. 8, 1932.

PIPE BOWL Filed Oct. 23, 1931 Patented Nov. 55, 1932 erase i we e ewe 1Fed t R a f fl. Li m. i ii f. li vriit HENRI GAUVIN, QF OTTAWA, GNTABIO,CANADA PIPE BOWL Application filed October 23, 1931. Serial No. 570,582.

thorities, however, have shown that this substance is really tar oilwhich, of course, is very offensive and injurious to some extent.

Virtually, when smoking, the smoker is in eiiect operating a smalldistillery plant and, through the condensation set up in the pipe bowl,tar oil is formed, all from the combi nation of tobacco, water, heat,combustion, smoke, condensation, saliva, soot, etc.

It is, therefore, 'an object of the present invention entirely to avoidthis primary disadvantage by providing a pipe bowl which will entirelyeliminate condensation within the pipe and thereby avoid the formationof tar oil, which is a usual result in smoking the ordinary pipe.

A further object of the invention is to provide a very simple form ofpipe bowl which may be adapted to any form of pipe and which may bereadily manufactured very economically.

A further object of the invention is to provide a pipe bowl which may bemade from metal, refractory material or the like, and which will notoverheat.

With these and other objects in View, the invention consists essentiallyin a pipe bowl preferably of the removable type which is of doublewalled structure, the outside surface of the inner wall constituting thepipe bowl proper and the outer surface of the exterior wall constitutingthat part of the bowl which contacts with the parts of the pipe in whichit is mounted.

A salient feature of the bowl consists in the fact that the wallsreferred to are spaced apart to form an air-tight chamber within thebowl and entirely surrounding the bowl proper, said chamber being sealedto form a dead air space or a vacuum or filled with an insulatingmaterial which will accomplish similar results to a dead air space orvacuum.

This construction will prevent to a large ex tent the transmission ofheat from the smoking chamber to other parts of the pipe; and, willeliminate condensation walls of the bowl.

The bowl is provided with to the bottom thereof to permit the passage ofair during smoking in the usual manner on the inner M and the bowl maybe formed from suitable material, such as a light metal, refractorywjmaterial, or the like, as more fully described in the followingspecification and illustrated in the accompanying drawing which formspart of the same.

In the drawing Figure 1 illustrates a perspective view of one form ofremovable bowl.

Figure 2 is a side elevation of the pipe, the bowl structure of which isshown in cross section illustrating, also in cross section, theremovable bowl with spaced walls and chamber therebetween.

Figure 3 is a'section taken on the line 33 of Figure 2, and,

Figure 4 is a sectional elevation of a further form in whichtheremovable bowl may be constructed.

Referring more particularly to the drawing, .A indicates the improvedpipe bowl made according to the present invention and B, for thepurposes of illustration, indicates any suitable pipe. The pipe bowl isconstructed of the exterior wall 10 and interior wall 11, the interiorwall constituting the bowl proper. These walls are spaced apart fromeach other to form the chamber 12 there between, this chamber entirelysurrounding the bowl proper 11 and adapted to house an insulatingmedium. The base of the pipe 7 bowl is provided with an air passagewaylSwhich communicates with the interior of the bowl proper and is sealedfrom the chamber 12 by means of the walls 14.

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According to the invention, the chamber 12 I constitutes a dead airspace, this being possible due to the fact that'the walls 10, 11 and 14are entirely sealed and a true dead air space may, therefore, be formedin the chamber 12. Alternatively and preferably, the air is Withdrawnfrom the chamber 12 to form a vacuum chamber but, on the other hand, itis within the scope of the present invention to pack the chamber 12 withinsulating material which will yield practicalvly the same results thatare obtained through the dead air space or vacuum.

By constructing the bowl in this manner, the transmission of heat fromthe bowl proper or smoking chamber 11 to other parts of m the pipe isavoided and also condensaed, apart from the fact that the structure isfire-proof and also odur-proof in view of;

the fact that the formation of tar oil is avoided, which is the maincause of odour.

The bowl A may be applied to a pipe structure in any suitable manner andin Figure 2 one practical form is illustrated. The bowl shell of thepipe is formed in two separable parts 15 and 16, each being screwthreaded as at 17 to unite illustrated in Figure 2. T he inturnedflanges 18 of the bowl shell will abut the upper edge of the removablepipe bowl A. to lirmly hold it in position when section 15 is screwedtightly upon section 16 and the lower part of the bowl will contact witha suitable washer l9 placed in the section 16 in order to provide acertain resiliency in the seating of the bowl A. The section 17 may bebored to form the well 20 which communicates with the smoking passageway21 ot' the pipe stem. In this way saliva will remain in the well 20 andwill not contact with the to bacco in the bowl proper or smoking chamber8Q 11 and, since the transmission of heat is large- 7 ly avoided andcondensation eliminated, the

formation of tar oil is entirely obviated.

The bowl A, according to the present invention, may be formed in variousways and the formation of the bowl entirely depends on the type of pipewith which it is desired to be used. In Figure 4 one other form of bowlis illustrated which is of practically straight walled structurethroughout provided with the insulating chamber and form-ed on the basewith a seat 22. This seat may readily extend within a washer or thelike, such as 19 illustrated in Figure 2, and provide a verysnug-fitting bowl. 59 It is conceivable that in forming an allmetal pipethe integral bowl might be constructed with a chamber such asillustrated in the removable bowl illustrated in the present applicationand it should be understood that the present invention is applicable toa bowl of this type also but the removable bowl is preferred.

Various modifications may be made in the invention without departingfrom the spirit thereof or the scope of the claims and, therefore, theexact forms shown are to be taken as illustrative only and not in alimiting sense, and I desire that only such limitationsshall be placedthereon as are imposed by the prior tion on the inner walls of the bowlis avoidart or are specifically set forth in the appended claims.

I claim 1. A removable insert for a pipe bowl comprising a bowl shapedshell formed with double walls in spaced relation, the air from withinthe space between said walls being exhausted and said space being sealedto provide a vacuum insulation for said bowl.

2. In a pipe, a bowl, a removable insert seated within said bowl andspaced from the walls thereof, said insert comprising a double walledmetallic shell having the space between the walls thereof sealed toprovide a vacuum chamber.

3. A removable pipe bowl comprising, a double walled shell with thewalls thereof in spaced relation providing an intermediate sealed vacuumchamber, said walls being shaped to substantially the contour of a con-'ventional pipe bowl, said shell having a tobacco receiving chamber openat one end and provided with a restricted air passage in the baseextending through said walls and sealed from said chamber.

l. In a pipe, a bowl, a removable insert seated within said bowl andspaced from the walls thereof, said insert comprising a double walledshell having the space between-the walls thereof sealed to provide aninsulating chamber.

In witness whereof I have hereunto set my hand.

HENRI GAUVIN.

